Browsing ELibrary by Subject "D" LAYER"

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  • IS THERE A FIRST-ORDER DISCONTINUITY IN THE LOWERMOST MANTLE? 
    Liu X.F.; Tromp J.; Dziewonski A.M. (1998)
    In 1983, Lay and Helmberger [Geophys. J. R. Astron. Soc. 75 (1983) 799-837] reported the detection of a precursor to the seismic phase ScS. They attributed this precursor to a sharp seismic discontinuity located several ...
  • VALENCE STATE AND SPIN TRANSITIONS OF IRON IN EARTH'S MANTLE SILICATES 
    Zhang F.; Oganov A.R. (2006)
    Using ab initio simulations, we investigated the valence and spin states of iron impurities in the perovskite (Pv) and post-perovskite (PPv) polymorphs of MgSiO3. In agreement with the previous experimental work, we find ...